Metalliferous monoazo dyestuffs



Patented July 10, 1951 UNITED STATES PATENT OFFICE METALLIFEROUS MON OAZO DYESTUFFS No Drawing. Application October 22, 1948, Serial No. 56,048

4 Claims. 1

This invention relates to novel water-soluble metalliferous azo dyestuffs yielding dark shades on wool and similar animal fibers of outstanding fastness to light, washing and fulling and having excellent resistance to crocking.

The dyestuffs of this invention are obtained by coupling a diazotized mononuclear orthoaminophenol sulfonic acid or sulfonamide with a naphthioindoxyl (i. e., a benzo-3-oxythionaphthene) and reacting the resulting azo dye, either before, during or after dyeing, with a metal complex-forming compound of a metal having an atomic weight from 52 to 64.

The thiophene nucleus of the naphthioindoxyl can be condensed with the naphthalene nucleus thereof in 1-2, 2-1 or 2-3 position, and the naphthalene nucleus can be further substituted,

e. g., by halogen such as chlorine or bromine,

lower alkyl groups or lower alkoxy groups. The benzene ring of the diazo component can also be further substituted, e. g., by nitro, halogen, carboxy, lower alkyl or lower alkoxy groups.

The unmetallized intermediate azo compounds employed in accordance with this invention yield brownish or reddish shades on wool which are quite sensitive to alkaline or acid treatment and to oxidation, so that the resulting dyeings as such are of no practical value. However, when the azo compounds are metallized by reaction with a metal complex-forming compound of a metal having an atomic weight from 52 to 64, e. g.. chromium, copper, nickel and cobalt, and preferably chromium, either before, during or after application of the azo compounds to the animal fibers to be dyed, much deeper shades are obtained, particularly dark blue to black, which are no longer sensitive to oxidation, alkaline or acid treatment and which possess the outstanding fastness properties indicated above.

It was known heretofore, as disclosed in U. S. Patent 1,233,433 and German Patent 193,724, to prepare metallized monazo dyestuffs from the product obtained by coupling a diazotized aminophenol sulfonic acid with thioindoxyls. While the resulting dyestuffs and colorations produced therewith have moderate fastness properties, according to present standards they are deficient for many purposes, particularly in fastness to washing and to light. Thus, the fastness to washing of a number of chromed monazo dyestuffs obtained from a diazotized ortho-aminophenol sulfonic acid and thioindoxyls was rated to be fair at best, while the light fastness measured in a fadeometer was between 35 and 65 hours. On the other hand, similarly chromed azo dyestuffs of the present invention obtained from diazotized aminophenol sulfonic acid and naphthioindoxyls exhibited excellent fastness to washing, and had a light fastness, similarly measured, of 100 to 200 hours.

The dyestuffs in accordance with the present invention are illustrated by the following examples, wherein parts are by weight.

Example 1 1 3O OaH A quantity of wool was dyedby a top chrome procedure, involving treatment in a hot bath containing the aforesaid azo compound, with Glauber salt and dilute sulfuric acid, whereby a brownish red shade was produced. After the dyestuff was exhausted, 1 to 3% of bichromate was added and the bath heated to boiling for /g' to 1 hour. The dyed material was then rinsed and dried. A deep blue-black shade was obtained, having excellent fastness to washing, and a light fastness of from 100 to 200 hours as measured in a fadeometer.

Similar shades are produced in a monochrome process, wherein for example, sodium and ammonium bichromate are added to a bath at about 40 C. containing 10% Glauber salt together with the above azo compound. Wool is introduced into the bath, which is heated to boiling for 2 hours. A deep blue-black shade is likewise obtained having the same fastness properties produced in the top chrome process.

The azo compound of this example can be converted .to'its chromium complex by boiling an Example 2 18.9 parts of 2-aminophefiol-4-sulf6nic acid are diazotized as described in Example 1', and the resulting solution is added to a mixture of 23.5

parts of 8-ch1oro-1,Z-naphthioindoxylwith- 200 parts of 40% aqueous sodium hydroxide'soluti'on The resulting azo compound which isseparated from the solution by salting out and filtering has.

the following formula:

OH HO SO H Thiscomp'ound can be converted into itschro mium complex in substance or on the fiber as de scribed in Example 1. W001 is dyed by application of the chromium complex of the azo compound, or by the monochrome or top chrome procedure'of the preceding example in deep blueblack shades having fastness properties similarto thoseindieated'f'or the'dyestufi of Examplel.

Dyestufis having similar fastness properties are obtained from the corresponding 1,2'-" and 2,3-

naphthioindoxyls, when coupled with diaz'otihed 2=aminophenoh' i' sulfonic acid and chromed by the procedure" of the foregoing examples. Iiistead' of 2-a1ninophenol-4 sulfonic acid, the cor responding sulfio'namide can be employed in the examples'with similar results."

Other ortho-aminophenol sulfonic acids which can be employed in producin the metalliferous azo dyestuffs of this invention can be further substituted in the benzene nucleus by-such groups as nitro, halogen (chlorine or bromine} carboxyl, lower alkyl such as methyl or ethyl groups, or lower alkoxy groups such as methoxy or ethoxy groups, or by more than one of these substituents. Thus, suitable ortho-aininophenol sulfonic acids include the following: S-methyl-Z-aminophenol-4-sulfonic acid fi-methyl Z-ahainophenol--sulfonio acid 5-methoxy-2 aminopheno1-4-sulfonic acid-- 6-chloro-Z-aminophenol-4-sulfonic acid 6-oarboxy-2-aminoph nol-4-sulfonic acid 5-nitro-2-aminophenol-4-sulfonic acid 6-nitro-2-aminophenol-4-sulfonic acid 5-nitro-6-methyl-2-aminophenol-4sulfonic acid 5-nitro-6-chloro-2-aminophenol-4-sulfonic acid 2-aminophenol5-sulfonic acid 4-methyl-2-aminophenol-5-su1fonic acid 4-chloro-2 aminophenol-5-sulfonic acid 4-chloro-2-aminoph'enol-6-sulfonic acid 2 4-nitro-i2-aminophenol-6-sulfonic acid 4-methyl-2-aminophenol-fi-su'lfonicacid 4-chloro-5-nitro-2-aminophenol-6-sulfonic acid" 4-me thyl-5-nitro-2-aminophenol-6-sulfonic acid -ohloro-2-aminophenol-3-sulfonic acid I G-methoxy-Z-aminophenol-3-sulfonic acid The correspcnding sulfonamides can be em- '4 pling component in preparing the azo compounds of this invention can also be substituted in the free positions of the naphthalene nucleus, for example, by chlorine, bromine, methyl, ethyl, methoxy and ethoxy groups, or by more than one of these groups. Thus, dyestufis having similar properties to those obtained in the examples can be prepared by using 8-chloroor 8-bromo-L2- naphthioindoxyl, 5-chloro-6-methoxy-2,l-naphthioindoxyl, 5-bromo-6-methoxy-2,1-naphthioindoxyl, 5-chloro-6-ethoxy-2,1-naphthioindoxyl and B-bromo-G-ethoxy 2,1 naphthioindoxyl. The 1,2- and 2,1-naphthioindoxyl can be prepared from the corresponding naphthalene 1- or Z-sulfo acids respectively, containing, for example, halogen, alkyl or alkoxy groups in positions other than the ortho position to the sulfonic acid radical, by conversion to the corresponding sulfohyl chloride, reduction thereof to the corresponding mercaptan, conversion of the latter to a thioglycollic acid radical by condensation with chloroacetir': acid, transformation of this radical to the corresponding acid chloride by reaction with phosphorus trichloride and efiecting ring closure in the presence of aluminum chloride; The 2,3-naphthioindoxyls can be obtained from 2-a'mino-3-na'phthoic acid and its alkyl, halogen and alkoxy substituted-derivatives by conversion of the amino group to a mercapta'n group by dia'z'otization- -and'reaction with a sulfide, transfer mationof themercaptoradical to a thio'glycollic acid radical by reaction with chloroac'etic acid;

and ring closure with the elimination of' carbon dioxide toform the desired product.

The chroming treatment of the'foregoing ex} aniples can-be appliedto any of the dyestuffspre' pared-from the foregoing azo dye compounds,

either in substance or by treatment during or after dyeing with the metallized" compound; Suitable chroming agents include alkali metal chroma'tes,-- and water-soluble chromium salts suchas chromium fluoride. Insteadof chromium compounds, other comp-lex forming compounds of metals having an atomic weight from 52 to64 can beer'nployed inthe same manner to prepare the corresponding metallized azo compounds in Substance or on thefiber.

having deep shades.

stance, or on the fiber during or after dyeing;

the same metalliferous dyestuffs are evidently Accordingly, the' step of produced in each case. metallizing specified in-the following claimsin"-' cludes met'allilzation in substance as well'as' on thefiber, and the metallized dyestuffs in'cludethe dyestuifs formed by'any of these methods.

Variations and modifications Which will be'fobviou'sto those skilled in the art .can' be made in: the compositions and processes of this invention Without departing from the scope thereof.

We 'claim:

52 to 64, corresponding to amonazo dyestuff haw in the formula:

wherein A is the radical of a I naphthioindoxylf attached to'the azo group in the 2-position, and

Such'comp'oun'dsincl'ude copper sulfate, cuprous chloride; copper'ni-,' trate; and the corresponding nickel or cobalt" salts. These metals likewise yield dyestuffsa'nd colorations of outstanding fastness properties O-QH HO om 4. A chromed monazo dyestufi containing chromium in complex combination and corresponding to the azo dyestuff having the formula:

HEINRICH H. BES'IEI-IORN. WILHELIVI SCI-HVIIDT-NICKELS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Wuth et a1 July 17, 1917 OTHER REFERENCES Friedlander et al., Ann. der Chemie, v. 388 (1912), DP- 10-11, 2 pages.

Number 

1. WATER-SOLUBLE METALLIZED MONAZO DYESTUFFS CONTAINING IN COMPLEX COMBINATION A COMPLEX FROMING METAL HAVING AN ATOMIC WEIGHT OF FROM 52 TO 64, CORRESPONDING TO A MONAZO DYESTUFF HAVING THE FORMULA: 